成层地基–桩基–结构动力相互作用体系的计算分析
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摘要
以一个1∶2大比例模型结构–地基的动力相互作用模型试验为基础,结合通用有限元程序MSC.Marc,对成层地基–桩基–结构动力相互作用体系进行了三维有限元分析。计算中采用考虑土非线性特征改进的黏弹性人工边界模拟外部土域,利用考虑动力相互作用中桩土分离、滑移以及桩基提离效应的接触模型反映桩土接触界面特性,并引入阻尼项表征桩土动力作用中的能量损耗,土体采用等效线性模型。通过计算分析与试验的比较研究,验证了计算模型和分析方法的合理性,进行了地震动输入下的地震反应分析,为地基–结构动力相互作用的进一步研究奠定了基础。
3D finite element analysis of layered soil-pile-structure model test on a scale of 1∶2 was carried out.General finite element program MSC.Marc was adopted in the analysis.The viscous-spring artificial boundary considering the dynamic nonlinear behaviors of soil was used to simulate the far field,and the 3D contact model was applied to simulate the effect of separating,sliding and pile uplifting in the dynamic soil-pile interaction.At the same time,the problem of the energy dissipation during dynamic interaction was solved by adding the damping component,and common equivalent linearity model was chosen to consider the non-linearity of soil.The rationality of computational model and analysis method was verified through comparison between the calculated and test results.The present work laid a foundation for further studies on dynamic soil-structure interaction.
3D finite element analysis of layered soil-pile-structure model test on a scale of 1∶2 was carried out.General finite element program MSC.Marc was adopted in the analysis.The viscous-spring artificial boundary considering the dynamic nonlinear behaviors of soil was used to simulate the far field,and the 3D contact model was applied to simulate the effect of separating,sliding and pile uplifting in the dynamic soil-pile interaction.At the same time,the problem of the energy dissipation during dynamic interaction was solved by adding the damping component,and common equivalent linearity model was chosen to consider the non-linearity of soil.The rationality of computational model and analysis method was verified through comparison between the calculated and test results.The present work laid a foundation for further studies on dynamic soil-structure interaction.
引文
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[2]YAZDCHI M,KHALILI N,VALLIAPPAN S.Dynamic soil-structure interaction analysis via coupled finite-element-boundary-element method[J].Soil Dynamic and Earthquake Engineering,1999,18(7):499–517.
[3]陈波,吕西林,李培振,等.用ANSYS模拟结构-地基动力相互作用振动台试验的建模方法[J].地震工程与工程振动,2002,22(1):126–131.(CHEN Bo,LüXi-lin,LI Pei-zhen,et al.Modeling of dynamic soil-structure interaction by ANSYS program[J].Earthquake Engineering and Engineering Vibration,2002,22(1):126–131.(in Chinese))
[4]陈波,吕西林,李培振,等.均匀土–桩基–结构相互作用体系的计算分析[J].地震工程与工程振动,2002,22(3):91–99.(CHEN Bo,LüXi-lin,LI Pei-zhen,et al.Computational analysis of dynamic homogeneous soil-pile-structure interaction[J].Earthquake Engineering and Engineering Vibration,2002,22(3):91–99.(in Chinese))
[5]王海东.地基–桩(筏)–上部结构动力相互作用分析与大比例模型试验研究[D].长沙:湖南大学,2005.(WANG Hai-dong.The analysis and dynamic soil-pile(raft)-superstructure interaction and test research on large-model of soil-pile(raft)-frame structure[D].Changsha:Hunan University,2005.(in Chinese))
[6]廖振鹏.工程波动理论导论[M].北京:科学出版社,2002.(LIAO Zhen-peng.Introduction to wave motion theories in engineering[M].Beijing:Science Press,2002.(in Chinese))
[7]刘晶波,吕彦东.结构–地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55–64.(LIU Jin-bo,LüYan-dong.A direct method for analysis of dynamic soil-structure interaction[J].China Civil Engineering Journal,1998,31(3):55–64.(in Chinese))
[8]卢华喜.成层地基–桩基–上部结构动力相互作用理论分析与试验研究[D].长沙:湖南大学,2006.(LU Hua-xi.Theoretical analysis and test research on dynamic layered soil-pile-structure interaction[D].Changsha:Hunan University,2006.(in Chinese))
[9]王满生,周锡元,胡聿贤.桩土动力分析中接触模型的研究[J].岩土工程学报,2005,27(6):616–620.(WANG Man-sheng,ZHOU Xi-yuan,HU Yu-xian.Studies on contact model of soil-pile dynamic interaction[J].Chinese Journal of Geotechnical Engineering,2005,27(6):616–620.(in Chinese))
[10]武芸.大比例土–桩基–框架模型动力相互作用试验模拟分析[D].长沙:湖南大学,2005.(WU Yun.The simulation and analysis of large scale soil-pile raft foundation-frame model for dynamic interaction[D].Changsha:Hunan University,2005.(in Chinese))
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